从成立麦克唐奈飞机于1939年到1960年代初以来，大量的努力，投入的直升机技术。
From the founding of McDonnell Aircraft in 1939 into the early 1960s, substantial effort was invested in helicopter technology.
飞机和直升机从空中播撒化学品，目前为止还未能阻止漏油，漏油已危害到野生物。
Planes and helicopters spraying chemicals from the air have so far failed to break up this leak, and the oil has already started to damage wildlife.
飞机和直升机从空中播撒化学品，目前为止还未能阻止漏油，漏油已危害到野生物。
Planes and helicopters spraying chemicals from the air have so far failed to break up the slick, and the oil has already started to damage wildlife.
飞机和直升机从空中播撒化学品，目前为止还未能阻止漏油，漏油已危害到野生物。
Planes and helicopters spraying chemicals from the air have so far failed to break up the slick, and the oil has already started to damage wildlife.
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